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Puzzle ZACP 



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What is the 20th prime number?

2, 3, 5, 7, ...

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Answer
71.

The first twenty prime numbers are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71.

 

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